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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jackrabbit.spi.commons.query.qom;
import org.apache.jackrabbit.spi.commons.conversion.NamePathResolver;
import org.apache.jackrabbit.spi.Name;
import javax.jcr.query.InvalidQueryException;
import java.util.Map;
import java.util.HashMap;
import java.util.Arrays;
import java.util.Iterator;
/**
* QueryObjectModelTree implements the root node of an object
* query model tree.
*/
public class QueryObjectModelTree extends AbstractQOMNode {
/**
* The node-tuple source for this query.
*/
private final SourceImpl source;
/**
* The constraint for this query.
*/
private final ConstraintImpl constraint;
/**
* The orderings for this query.
*/
private final OrderingImpl[] orderings;
/**
* The columns for this query.
*/
private final ColumnImpl[] columns;
/**
* All selectors available in this query object model. Key=Name
*/
private final Map selectors = new HashMap();
public QueryObjectModelTree(NamePathResolver resolver,
SourceImpl source,
ConstraintImpl constraint,
OrderingImpl[] orderings,
ColumnImpl[] columns)
throws InvalidQueryException {
super(resolver);
this.source = source;
this.constraint = constraint;
this.orderings = orderings;
this.columns = columns;
for (Iterator it = Arrays.asList(source.getSelectors()).iterator(); it.hasNext(); ) {
SelectorImpl selector = (SelectorImpl) it.next();
if (selectors.put(selector.getSelectorQName(), selector) != null) {
throw new InvalidQueryException("Duplicate selector name: " +
selector.getSelectorName());
}
}
if (selectors.size() == 1) {
// there is only one selector, which is also a default selector
selectors.put(null, selectors.values().iterator().next());
}
checkQuery();
}
/**
* Gets the node-tuple source for this query.
*
* @return the node-tuple source; non-null
*/
public SourceImpl getSource() {
return source;
}
/**
* Gets the constraint for this query.
*
* @return the constraint, or null if none
*/
public ConstraintImpl getConstraint() {
return constraint;
}
/**
* Gets the orderings for this query.
*
* @return an array of zero or more orderings; non-null
*/
public OrderingImpl[] getOrderings() {
OrderingImpl[] temp = new OrderingImpl[orderings.length];
System.arraycopy(orderings, 0, temp, 0, orderings.length);
return temp;
}
/**
* Gets the columns for this query.
*
* @return an array of zero or more columns; non-null
*/
public ColumnImpl[] getColumns() {
ColumnImpl[] temp = new ColumnImpl[columns.length];
System.arraycopy(columns, 0, temp, 0, columns.length);
return temp;
}
/**
* Returns the selector with the given name or
* null if there is no selector with this name.
*
* @param name the name of a selector.
* @return the selector or null if there is no such selector.
*/
public SelectorImpl getSelector(Name name) {
return (SelectorImpl) selectors.get(name);
}
//-----------------------< AbstractQOMNode >--------------------------------
/**
* Accepts a visitor and calls the appropriate visit method
* depending on the type of this QOM node.
*
* @param visitor the visitor.
*/
public Object accept(QOMTreeVisitor visitor, Object data) throws Exception {
return visitor.visit(this, data);
}
/**
* Checks if this QOM is valid.
*
* @throws InvalidQueryException if the QOM is invalid.
*/
private void checkQuery() throws InvalidQueryException {
// TODO: validate query completely.
// checks currently implemented:
// - check for selector names
try {
accept(new DefaultTraversingQOMTreeVisitor() {
public Object visit(ChildNodeImpl node, Object data) throws Exception {
return checkSelector(node.getSelectorQName());
}
public Object visit(ColumnImpl node, Object data) throws Exception {
return checkSelector(node.getSelectorQName());
}
public Object visit(DescendantNodeImpl node, Object data) throws Exception {
return checkSelector(node.getSelectorQName());
}
public Object visit(EquiJoinConditionImpl node, Object data)
throws Exception {
checkSelector(node.getSelector1QName());
return checkSelector(node.getSelector2QName());
}
public Object visit(FullTextSearchImpl node, Object data) throws Exception {
return checkSelector(node.getSelectorQName());
}
public Object visit(FullTextSearchScoreImpl node, Object data)
throws Exception {
return checkSelector(node.getSelectorQName());
}
public Object visit(NodeLocalNameImpl node, Object data) throws Exception {
return checkSelector(node.getSelectorQName());
}
public Object visit(NodeNameImpl node, Object data) throws Exception {
return checkSelector(node.getSelectorQName());
}
public Object visit(PropertyExistenceImpl node, Object data)
throws Exception {
return checkSelector(node.getSelectorQName());
}
public Object visit(PropertyValueImpl node, Object data) throws Exception {
return checkSelector(node.getSelectorQName());
}
public Object visit(SameNodeImpl node, Object data) throws Exception {
return checkSelector(node.getSelectorQName());
}
public Object visit(SameNodeJoinConditionImpl node, Object data)
throws Exception {
checkSelector(node.getSelector1QName());
return checkSelector(node.getSelector2QName());
}
private Object checkSelector(Name selectorName)
throws InvalidQueryException {
if (!selectors.containsKey(selectorName)) {
String msg = "Unknown selector: ";
if (selectorName != null) {
msg += QueryObjectModelTree.this.getJCRName(selectorName);
} else {
msg += "";
}
throw new InvalidQueryException(msg);
}
return null;
}
}, null);
} catch (Exception e) {
throw new InvalidQueryException(e.getMessage());
}
}
//------------------------< Object >----------------------------------------
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("SELECT ");
if (columns != null && columns.length > 0) {
for (int i = 0; i < columns.length; i++) {
if (i > 0) {
builder.append(", ");
}
builder.append(columns[i]);
}
} else {
builder.append("*");
}
builder.append(" FROM ");
builder.append(source);
if (constraint != null) {
builder.append(" WHERE ");
builder.append(constraint);
}
if (orderings != null && orderings.length > 0) {
builder.append(" ORDER BY ");
for (int i = 0; i < orderings.length; i++) {
if (i > 0) {
builder.append(", ");
}
builder.append(orderings[i]);
}
}
return builder.toString();
}
}
